Encapsulate token utilities in TokenStream

Cargo.toml

@@ -13,7 +13,7 @@ chumsky = { version = ">=0.9.0, <0.10.0", default-features = false, features = [
 log = { version = ">=0.4.0, <0.5.0", default-features = false }
 
 [dev-dependencies]
-rstest = ">=0.18.0, <0.19.0"
+rstest = ">=0.25.0, <0.26.0"
 
 [lints.clippy]
 pedantic = { level = "warn", priority = -1 }

docs/ddlint-design-and-road-map.md

@@ -195,6 +195,11 @@ sequenceDiagram
     Parser-->>User: Parsed { green, root }
 ```
 
+After tokenization the parser wraps the vector of tokens in a lightweight
+`TokenStream`. This structure manages the current cursor and exposes helper
+methods such as `line_end` or `skip_ws_inline`. Navigating tokens through this
+abstraction avoids manual index arithmetic and reduces boundary errors.
+
 ### 2.1. Defining the DDlog `SyntaxKind`
 
 Following the established `rowan` pattern, the grammar of the DDlog language

docs/rust-testing-with-rstest-fixtures.md

@@ -107,9 +107,9 @@ section:
 
 ```toml
 [dev-dependencies]
-rstest = "0.18" # Or the latest version available on crates.io
+rstest = ">=0.25.0, <0.26.0" # Matches project manifest
 # rstest_macros may also be needed explicitly depending on usage or version
-# rstest_macros = "0.18" # Check crates.io for the latest version
+# rstest_macros = ">=0.25.0, <0.26.0"
 ```
 
 It is advisable to check `crates.io` for the latest stable version of `rstest`